// Copyright 2020 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { DefinePlugin } from 'webpack';
import merge from 'webpack-merge';
import Workbox from 'workbox-webpack-plugin';

import common from './webpack.common';

export default merge(common, {
  devtool: 'source-map',
  mode: 'production',
  plugins: [
    new DefinePlugin({
      ENABLE_UI_SW: JSON.stringify(true),
      IS_DEV: JSON.stringify(false),
    }),
    new Workbox.GenerateSW({
      // Setting this to true means the old assets will be purged when a new
      // version is detected, causing existing clients to break.
      // However, this also means new release will not take effect until users
      // close all build page tabs.
      skipWaiting: false,
      navigateFallback: '/ui/index.html',
      // Workbox source map changes every build.
      // This causes noise in the auto-roller.
      // https://github.com/GoogleChrome/workbox/issues/2784
      sourcemap: false,
      importScriptsViaChunks: ['service-worker-ext'],
    }),
  ],
});
